chaeles sinnixg



J. B. DESNOYERS & 0; SIN'NIN'G.

(No Mqdel.)

BUTTON HOLE SEWING MACHINE.

Patented JaIL B ilnrrnn STATES FArnN'r Orricn.

JEROME B. DESNOYERS AND CHARLES SINNIXG, OF ST. LOUIS, MISSOURI.

BUTTON-HOLE SEWING-MACl-HNE.

SPECIFICATION forming part of Letters Patent No. 291,701, dated January8, 1884:.

Application filed August '7, 1833. (X0 model.)

To all whom, it may concern:

Be it known that we, JEROME l3. DESNOY- mm and OrrirnLns SINNING, bothof the city of St. Louis, in the State of Missouri, have invented acertain new and useful Improvement in Button-Hole Sewing-"llachines, ofwhich the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, forming part of thisspeciiication.

Reference is made to the claims for statement of invention.

Figure 1 is aside view of the machine. Fig. 2 is a horizontal section at2 2, Fig. 1. Fig. 3 is an end view. Fig. 4 is an enlarged detail sectionat 4. 4, Fig.3. Figs. 5, 6, and 7 are enlarged detail views illustratingthe construction of the brakes.

A is the bed-plate of abutton-hole sewingmachine.

B is the gooseneck, carrying theneedle-bar C and shaftD,actuatingtheneedle-bar, as usual.

E isabalancewheel fast upon the shaft D.

F is the drive-wheel turning loose on the shaft D.

G is a friction pad or plate interposed between the balance-wheel andthe drive-wheel, so that the pressure of the latter against the pad orplate communicates motion to the shaft D. The drivewheel is grooved toreceive the ordinary drive-belt-.

H is a forked leverfulcrumed atlto a brackct, J, extending from thevertical post of the goose-neck. The arm H of the forked lever carriesat its upper end a movable pin, K, in line with the shaft D, and whichmay be made to press against the center boss, F, upon the drive-wheel F,to force it against the friction pad or plate G, the pin sliding endwisein its socket. The pin ispressed toward the bossF' by a spring, L, whoseforce is adjusted by a screw, M, bearing against its inner side. The armH of the forked lever carries asteel brakeshoe, N, whose shank worksendwise in the arm, and is pressed toward the balance-wheel by a spring,O.

P l? are two inclined steel jaws upon the side of the balance-wheel, thejawshavingbetween them a gap, Q,large enoughto receive thebrakeshoe. Therelative arrangement of the pressure-pin K and brake-shoe Nis such thatwhen either of them is in action the other one is inactive. Forinstancc,when the machine is in operation, as shown in Figs. 1 and 2,the pin K is forcing the frictionwheel toward the balance-wheel and thebrake-shoe N is out of the course of the brake-jaws I, whereas when theforked lever H takes its other position the brake-shoe is carried intothe course of the brake-jaws P, which come in contact with the shoe andtend to check the motion of the balance-wheel, and when the gap Q ispresented to the shoe the latter enters it and at once stops the motionof the machine. The gap Q is in such place upon the balancewheel thatwhen the brake-shoe enters it the needle is in its upper position, so asto allow the adjustment of the work upon the clamp. \Vhen the brakeshoeis thrown toward the balance-wheel by the movement of lever H, saidmovement carries back the pressurepin K, and the frictionwhecl F isforced away from the balance-wheel by a concealed spring, R, betweenthem, and

ceases to act upon the balance-wheel, so that the brake easily stops itsrotation.

S is the ordinary movable clamp-plate to which the work is attached in abutton-hole sewing-machine, no novelty being claimed in this.

s is aprojection which comes in contact with a screw, T, upon a lever,U, when the buttonhole is about completed and pushes said lever into theposition shown in dotted lines in Fig. 2. This lever works on a pin, a,and has a catch, a, engaging a catch, "0, upon a spring-lever,V.

U is a spring tending to hold the lever U in the position shown in fulllines in Fig. 2, so that when the clamp S is moved forward the leverresumes this position. The spring-lever V is fulcrumed at 'V.

XV is a link connecting the lever V with a collanX, fixed upon a rod,Y,that is connected to the lower end or arm of the forked leverH.

Z is a spiral spring surrounding the rod Y, and tending to throw thelever into the position shown in dotted lines in Fig. 2, and thusdisengage the friction-gear E F.

The operation in brief is as follows: The parts being in position shownin dotted lines in Fig. 2, the work is secured to the clamp S, as usual,and then the lever V moved into the position shown in full lines in Fig.2, which puts the friction-gear in engagement. Vhen the button-holeisfinished, the stud 8 comes in contact with the end of screw T anddisengages the catches u 'u,when the springs Z and It disengage thefriction device, and the brake-shoe 'first cheeks and then stops themovement of the balance-wheel. The position ofthe brake when the machineis moving is shown in Fig. 7. Its position when first applied to thebalance-wheel is shown in Fig. 6, and its position when the machine isstopped is shown in Fig. 5.

The brake mechanism herein shown and described forms the snbj eet-matterof another application fo'r Letters Patent.

Ve claim as our invention- 1. The combination, with a moving clamp, S,of a sewing-machine, of levers U and V,

JEROME B. DESNOYERS. CHAS. SIN N ING.

XVitnesses:

SAML. KNIGHT, Enw. F. ISRAEL.

